From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Performance chart for an ethylene glycol cooling system, plotting air pressure and horsepower dissipated against air flow.
| Identifier | ExFiles\Box 149a\2\ scan0302 | |
| Date | 20th February 1935 | |
| CHART No. L 421 B ETHYLENE GLYCOL FRONTAL AREA = 6 COOLING SURFACE = 19.9 FT. RUN TUBING = 16.0 WT. OF TUBING = LBS LIQUID-WATER VELOCITY = 3.75 FT. SECOND 95.3 LBS. MIN. FT. OF WIDTH AIR INLET 92 °F WATER MEAN 192 °F LIQUID LIQUID DENSITY AT 190 °F = 1.08 (APPROX.) TUBE TYPE 23/5/16|24|1 1/8|37.0|76.5|06|15 2 ROWS STAGGERED PITCH OF TUBES = 1/2" Diagram shows 5 tubes in a staggered arrangement with dimensions 1.5", 1.5", and 5/32". Vertical Axis (Left): AIR PRESSURE INCHES OF WATER, scale from 0 to 1.5. Vertical Axis (Right): B.TH.U'S DISSIPATED/SQ FT. FRONTAL AREA, HORSE POWER DISSIPATED/SQ FT. FRONTAL AREA, scale from 0 to 30. Horizontal Axis: AIR FLOW CUBIC FT. MIN./SQ FT. FRONTAL AREA, scale from 0 to 1500. Graph Lines: AIR PRESSURE, HP DISSIPATED. Handwritten: 11/12/31, modified 20/2/35 | ||